The links below bring you directly to asthma-specific or asthma-support specific areas of each organization's site:

Allergy & Asthma Network:
Mothers of Asthmatics,
a support organization

American Academy of Allergy, Asthma & Immunology,
including an allergist/immunologist locator

American College of Allergy, Asthma & Immunology,
including a support group locator
and an allergist locator

American Lung Association

Asthma & Allergy Foundation of America,
with a link to support groups

Canadian Lung Association

Centers for Disease Control & Prevention

KidsHealth.com,
a site provided by The Nemours Foundation
For kids
For teens
For parents (click on link, then scroll down to "Asthma")

National Heart Lung & Blood Institute

National Library of Medicine,
National Institutes of Health

U.S. Environmental Protection Agency